"I know that I’ve let a lot of people down. The people of Minnesota, my colleagues, my staff, my supporters and everyone that has counted on me to be a champion for women," Franken said. "To all of you, I just want to say I’m sorry. I know there are no magic words I can say to regain your trust."

"I feel that you have to respect women’s experiences," Franken said. "From these stories it’s been clear that there are some women and one is too many who feel that I have done something disrespectful to them I am tremendously sorry."

"If you had asked me two weeks ago - would any woman come forward with this allegation, I would say no. This has been a shock and it's been extremely humbling. I am embarrassed, I feel ashamed," the Senator expressed. "I'm also going to try and learn from my mistakes. In doing so I've been doing a lot of reflecting and I want to be someone who adds something to the conversation."

The Democrat's comments were the latest indication that he had no plans to step down amid allegations of sexual misconduct. One woman alleges Franken forcibly kissed her on a USO tour and took a sexually suggestive photo while she was sleeping; three other women allege Franken grabbed their buttocks while posing with them for photos during separate campaign events in 2007, 2008 and 2010.

"I take thousands and thousands of pictures, sometimes in chaotic and crowded situations," Franken said in an interview aired Monday by CBS. "I can't say I haven't done that. I'm very sorry if these women experienced that."

Franken added that he has to be "a lot more sensitive, and a lot more careful" when he takes a picture and when he meets someone: "I'm going to make sure that this does not happen again."

Franken's interviews with Minnesota media outlets over the weekend were the first interviews granted since being swept into a nationwide tide of sexual misconduct allegations. Alabama Republican Senate candidate Roy Moore is accused of initiating sexual conduct with teenagers during the 1970s. And Michigan Rep. John Conyers is giving up his leadership position as top Democrat on the House Judiciary Committee amid a congressional probe into allegations of sexual harassment. Both men deny the allegations.

Franken told the Minneapolis Star Tribune he doesn't remember taking the specific photos, but said such groping is "not something I would intentionally do."

Asked whether he expected other women to step forward with similar allegations, Franken said: "If you had asked me two weeks ago, 'Would any woman say I had treated her with disrespect?' I would have said no. So this has just caught me by surprise. ... I certainly hope not."

The first woman to come forward was Los Angeles radio news anchor Leeann Tweeden. She released a photo earlier this month showing the then-comedian grinning while reaching out toward her chest, as if to grope her, as she slept on a military aircraft during a USO tour in 2006.

Franken told Minnesota Public Radio on Sunday the photo was "inexcusable." He declined to explain it further.

"What my intention was doesn't matter. What matters is that I am chained to that photo," Franken said. "She ... didn't have any ability to consent. She had every right to feel violated by that photo. I have apologized to her, and I was very grateful that she accepted my apology."

Tweeden said Franken also forcibly kissed her while rehearsing for a USO performance; Franken has said he has a different recollection of the rehearsal.

Franken faces a Senate ethics investigation — which he welcomed in the wake of Tweeden's allegation — though it's unclear when that review may begin. Franken, who hasn't faced widespread calls to resign, said he will fully cooperate.

Franken missed votes after the first accusations were made public. He said he spent the holiday break with his wife and the rest of his family. When he goes back to work Monday, he said, he'll ask tough questions about proposed tax legislation that "would affect Minnesota and the rest of the country in a terrible way."

Franken sidestepped when asked whether the allegations would make him less effective in the Senate. He noted he has apologized to women who have felt disrespected and "to everyone I have let down."

"I think this will take some time," he told Minnesota Public Radio. "I am trying to handle this in a way that adds to an important conversation. And to be a better public servant and a better man. That is what my goal is."

Franken came to the Senate after a months-long recount gave him a 312-vote victory in his 2008 election. He immediately tried to distance himself from his decades of professional comedy, which included raunchy writing and off-color jokes. He also avoided national reporters.

Dozens of women who have worked with Franken, including former Senate staffers and women who worked with him on NBC's "Saturday Night Live," signed statements supporting Franken following Tweeden's allegations.